<template>
  <header class="header">
    <h1>todos</h1>
    <input
      id="toggle-all"
      class="toggle-all"
      type="checkbox"
      v-model="selectAll"
    />
    <label for="toggle-all"></label>
    <input
      @keydown.enter="addTask"
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model="taskName"
    />
  </header>
</template>

<script>
export default {
  props: ["list"],
  data() {
    return {
      taskName: "",
    };
  },
  methods: {
    addTask() {
      if (this.taskName.length == 0) {
        return alert("名称不能为空");
      }
      this.$emit("delTaskHanderl", this.taskName);
      this.taskName = "";
    },
  },
  computed: {
    selectAll: {
      set(val) {
        
        this.list.forEach((item) => (item.isDone = val));
      },
      get() {
          if (this.list.length == 0) {
          return false;
        }
        return this.list.every((item) => item.isDone);
      },
    },
  },
};
</script>